I need help answering requirement 1 please

Emma's Bakery plans to purchase a new oven for its store. The oven has an estimated useful life of 4 years. The estimated pretax cash flows for the oven are as shown in the table that follows, with no anticipated change in working capital Emma's Bakery has a 10% after-tax required rate o return and a 30% income tax rate. Assume depreciation is calculated on a straight-line bass or tax purposes using the initial investment in the oven and its estimated terminal disposal value. Assume all cash flows occur at year-end except for initial investment amounts (Click the icon to view the estimated cash flows for the oven.) Click the icon to view the Future Value of $1 factor Click the icon to view the Future Value of Annuity of $1 factors. (Click the icon toview the Present Value ofS1 factors. BClick the icon to view the Present Value of Annuity of $1 fact s Read the requirements. Requirement 1. Calculate (a) net present value, (b) payback period, and (c) internal rate of return a. Net present value. (Use factors to three decimal places, x.xxx, and use a minus sign or parentheses for a negative net present value. Enter the net present value of the investment rounded to the nearest whole dollar.) The net present value is s b. Payback period. (Round your answer to two decimal places.) The payback period is c. Internal rate of return. (Use a trial-and-errorapproach and straight-line interpolation as necessary. Round all interim calculations to the nearest whole dollar and round the IRR to two decimal places, X.XX%.) The internal rate of retum (IRR) is years